Question

Which of the following statements is TRUE?

A. An orbital is the volume in which we are most likely to find an
electron.
B. Part of the Bohr model proposed that electrons in the hydrogen
atom are located in "stationary states" or particular orbits around
the nucleus.
C.The emission spectrum of a particular element is always the same
and can be used to identify the element.
D.The uncertainty principle states that we can never know both the
exact location and speed of an electron.
E. All of the above are true.